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Ben Replay	Bencode	Bencode (Quinton/Lalonde)
Bengali numerals	Beni Tracker module	Bento
Berkeley/IRCAM/Carl Sound Format	Betacam	BetacamSP
BetacamSX	Betamax	BetrFS
Bfloat16	BibTeX	Bibliographic data
Big5	BigTIFF	BigTable
Bikeshed	BinHex	BinPatch (Kay Hayen)
BinSCII	Binary-coded decimal	Binary Data
Binary II	Binary Terrain	Binary XML
Binhex	Bink Video	Binpatch
Binpatch (Jaap Korthals Altes)	BioRad confocal image	Biogenesis world
Bit	Bit order	Bitcoin
Bitsboard board	Black Wolf's Picture Encoder (StegoDos)	Blackboard Learning System
BlakHole	Blazing Paddles	BlindSide
Blinkytape	Blitz3D	Blitz3D Model
Blitz BASIC	BlockHashLoc	Blockyarchive/blkar
BlooP, FlooP, and GlooP	Blorb	Blots
Blowfish	Blu-ray 3D format	Blu-ray Clip info
Blu-ray Disc	BluRay Disc	BmpPacker
Bob's Adlib Music	Bob ray tracer bitmap	Bob ray tracer scene description
Bochs	BodyPaint 3D	Bonk
Bool (C++)	BoomTracker v4.0 module	Boom Tracker v4.0 module
BootSkin	BootSkin Vista	BootSkin XP
Border Screen	Borderlands save file	BorgBackup
Borland Delphi form	Borland Graphics Interface	Bosch stove fault codes
Bourne shell script	Box file format	Boxes/atoms format
Braille	Brain	Brain/DementiaSong
Brain/DementiaSong Everywhere at the End of Time by The Caretaker	Brainfuck	Breder
Breeze	Brian Postma SoundMon v1.x module	Brian Postma SoundMon v2.x & v3.x module
Bridge notation	Brik	Bringrr
Brother 240k